• Title/Summary/Keyword: Ink jet

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Experimental Analysis of Droplet Formation Process for Inkjet Printhead (잉크젯 헤드를 이용한 액적 토출 현상의 실험적 분석)

  • Jo, Y.M.;Park, S.J.
    • Journal of ILASS-Korea
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    • v.15 no.4
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    • pp.163-169
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    • 2010

  • Jetting stability is the most important factors in inkjet printing because printing quality is totally determined by shape of the droplets on the substrate. In order to acquire stable jet, viscosity and dynamic behavior of the ink must be considered. In addition, waveform to drive the inkjet printhead is also to be controlled. In this study, the driving waveform composed of rising time, dwell time and falling time is optimized to obtain a stable jetting using drop watcher system. Also, effect of ink viscosity on jetting is experimentally investigated by changing the temperature of ink cartridge. As a result, jetted drop having uniform velocity is acquired.

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Development of a new thermal inkjet head with the virtual valve fabricated by MEMS technology (멤스기술을 이용한 가상밸브가 있는 새로운 잉크젯 헤드 개발)

  • Bae, Ki-Deok;Baek, Seog-Soon;Shin, Jong-Woo;Lim, Hyung-Taek;Shin, SuHo;Oh, Yong-Soo
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1892-1897
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    • 2003

  • A new thermal inkjet printer head on SOI wafer with virtual valve was proposed. It was composed of two rectangular heaters with same size. So we could call it T-jet(Twin jet). T-jet has a lot of merits. It has the advantage of being fabricated with one wafer and is easy to change the size of chamber, nozzle, restrictor and so on. However, above all, It is the best point that T-jet has a virtual valve. And it was manufactured on SOI wafer. The chamber was formed in its upper silicon whose thickness was 40um. The chamber's bottom layer was silicon dioxide of SOI wafer and two heaters were located underneath the chamber's ceiling. And the restirctor was made beside the chamber. Nozzle was molded by process of Ni plating. Ni was 30um thick. Nozzle ejection test was performed by printer head having 56 nozzles in 2 columns with 600NPI(nozzle per inch) and black ink. It measured a drop velocity of 12m/s, a drop volume of 30pl, and a maximum firing frequency of 12KHz for single nozzle ejection. Throwing out the ink drop in whole nozzles at the same time, it was observed that the uniformity of the drop velocity and volume was less than 4%.

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An experimental study on the characteristics of transverse jet into a supersonic flow field (초음속 유동장에서의 충돌제트 특성에 대한 실험적 연구)

  • 박종호;김경련;신필권;박순종;길경섭
    • Journal of the Korea Institute of Military Science and Technology
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    • v.6 no.4
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    • pp.124-131
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    • 2003

  • When a secondary gaseous flow is injected vertically into a supersonic flow through circular nozzle, a complicated structure of flow field is produced around the injection area. The interaction between the two streams produces a strong bow shock wane on the upstream side of the side-jet. The results show that bow shock wave and turbulent boundary layer interaction induces the boundary layer separation in front of the side-jet. This study is to analyze the structure of flow fields and distribution of surface pressure on the flat plate according to total pressure ratio using a supersonic cold-flow system and also to study the control force of affected side-jet. The nozzle of main flow was designed to have Mach 2.88 at the exit. The injector has a sonic nozzle with 4mm diameter at the exit of the side-jet. In experiments, The oil flow visualization using a silicone oil and ink was conducted in order to analyze the structure of flow fields around the side-jet. The flow fields are visualized using the schlieren method. In this study, a computational fluid dynamic solution is also compared with experimental results.

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